Mastic containing and discharging device



Jan. 26, 1965 J. c. HOVELAND 3,167,219

MASTIC CONTAINING AND DISCHARGING DEVICE Filed Jan. 18, 1963 United States Patent Canada Filed San. 18, 1963, Ser. No. 252,527 1 Claim. (Cl. 222-391) This device relates generally to mastic discharging apparatus and particularly to a device that may be used as a handle for a mastic trowel'or other mastic tool, that will contain a quantity of mastic for the trowel and is constructed for discharge of the mastic from the handle to the trowel as desired.

In the application of tape over a dry wall joint, it is customary to use a device commonly called a bazooka which has a reel of tape at its forward end and which is used to apply the tape over the joint with a quantity of mastic beneath the tape. The tape then is pressed into the wall joint and further mastic applied over the tape by the use of squeeze-boxes which generally comprise a container for the mastic with a lid that is depressible by the manipulation of the handle to squeeze mastic from the box onto the tape.

Since the finishing of the tape on the wall may require the use of a number of squeeze-boxes of diminishing size and since each of these boxes must be filled with mastic, it is obvious that considerable apparatus must be maintained and a number of operations gone through to effect a satisfactory finish to joint.

A further disadvantage lies in the fact that the volume of mastic that may be carried in the squeeze-boxes is small if the weight of the boxes is to be kept within reasonable limits.

My device is designed to provide a cylinder that may be use as a handle for mastic applicators or trowels and at the same time, contain a sufficient quantity of mastic with means to discharge the mastic to the mastic trowel so that the average joint may be completely finished without the necessity of replenishing the supply of mastic.

Further, the provision of the mastic within the cylinder which, also acts as a handle, distributes the weight of the mastic throughout the handle rather than having the weight at the outer end of the handle as is the case with mastic carrying squeeze-boxes and the like.

In addition, my device includes a mastic nozzle at the forward end of the cylinder that is adapted to receive a variety of mastic applying trowels or finishing tools and these trowels and finishing tools can be engaged or disengaged from the nozzle with a minimum of time and effort.

In drawings illustrating a preferred embodiment:

FIG. 1 is a side elevation partly broken away and in section.

FIG. 2 is a side elevation showing the ratchet pawl disengaged from the ratchet teeth as the tube is moved out of the cylinder.

FIG. 3 is another side elevation illustrating the disengagement of the ratchet pawl when the pawl contacts the divider.

My device comprises the cylinder 1 which is of elongated construction to serve as a handle and preferably is constructed of a transparent material as for example, Plexiglas or the like. The cylinder 1 is provided at its forward end with the mastic discharging nozzle 2 secured by screw means 7 and tapered as illustrated at 4. The nozzle is formed with a ball for the attachment of mastic trowels and the like which receive mastic from the orifice 6. At its opposite end, the cylinder 1 is closed by the cap 3 which is secured to the cylinder 1 through holding screws 8 or the like.

A divider 9 is secured in the cylinder 1 through holding screws 10 or similar means and the divider 9 is formed with a central opening 11 which is coaxial with the cylinder 1 and is in line with the central opening 12 in the cap 3.

A piston rod indicated generally at 13 consists of the tube 14 which is supported in and operates slidably in the openings 11 and 12 in the cap 3 and divider 9. The tube extends at its one end 16 outside the cylinder 1 with a handle 15 secured to the end 16 and has a stop 17 secured to the opposite end of the tube 14 Within the cylinder and past the divider 9.

The ratchet bar 19 formed with spaced ratchet teeth 20 telescopes at one end within the tube 14 and is secured at its opposite end to the piston 21 by way of the holding nuts 22 or like means. As is common, the piston 21 is formed with peripheral rubber cups 23 or the like to insure a fluid tight seal with the internal periphery of the cylinder 1.

Engagement of the tube 14 with the rod 19 is by way of the ratchet pawl 24 which is mounted rotatably to the stop 17 at 25 and includes a spring 26 which acts to normally force the end 27 of the ratchet pawl into engagement with the teeth 20 on the bar 19.

Obviously, when the tube 14 is moved into the cylinder 1 toward the nozzle 2, the ratchet pawl will engage with one of the teeth 21 in the rod 19 to move the piston 21 forwardly in the cylinder. When the tube 14 is moved in the opposite direction or out of the cylinder 1, the ratchet pawl will ride along the rod 19 to override the desired number of teeth on the rod 19 whereupon the tube 14 again may be moved toward the nozzle 2 and the rod 19 and piston 21 will again be moved forwardly in the cylinder. In other words, as the tube 14 is reciprocated in the cylinder 1, the ratchet pawl 24 will engage with teeth 29 on the rod 19 to move the rod 19 and piston 21 forwardly in the cylinder whenever the tube 14 is moved forwardly and obviously any mastic contained in the cylinder between the piston and the discharging nozzle 2 will be forced out of the nozzle as desired.

When the piston 21 has been moved its maximum distance towards the discharging nozzle 2, it will be necessary to reload the cylinder 1. This is accomplished by first moving the tube 14 to its maximum rearward distance out of the cylinder 1 and, as best seen in FIG. 3 in the drawings, this will bring the ratchet pawl 24 into contact with the divider 9. This will rotate the ratchet pawl 24 about its pivot 25 so that it cannot engage with the ratchet teeth 29 and mastic or other material then may be forced into the cylinder through the orifice 6 to move the piston 21 rearwardly in the cylinder and telescope the rod 19 into the tube 14.

When the desired quantity of mastic has been forced into the cylinder, a mastic trowel or implement may be attached at the ball 5, the cylinder supported in the one hand of the operator to bring the mastic trowel or other implement to the desired height on the wall. The handle 15 then is grasped in the other hand of the operator and moved to reciprocate the tube 14 in the cylinder. This will move the piston 21 forwardly in the cylinder to force the mastic out of the orifice 6 to the trowel and to the surface of the wall or other surface as desired.

What I claim as my invention is:

A mastic containing and discharging device comprising a hollow cylinder having a nozzle at one end thereof, a piston slidably mounted in said cylinder, a piston rod in said cylinder fixed to said piston, said piston rod having-a seriesfof teeth in longitudinal alignrnent thereon, a tube axially arranged-in said'- cylinder and having one end extending outwardly from the other end of said' cylinder, the other end of'said tube being open, said I piston rod extending throughflsaidopen end of said "tube and beingxtelescopically disposedin said tube, a stop fixed to said tube adjacent said open .endthereof, a pawl pivotallyi mounted on said stop and being swingable into ,7

engagement with one of said teeth, said pawl having'a'n angularly extending arm, a spring fixed to said stop, and engaging said arm to urge said pawl into'engagement with'one'of said teeth, said pawl having locking engage .ment with one of said teethin response to movement of said tube in a direction towards said nozzle to -move said piston rod and .piston' therewithvand shaving releasing engagement with 'said teeth in response ,to. move lment of said tube in the fixed to said cylinder and disposed therein between said stop and said other end ofsaid cylinder, said plate being engageableby said pawlarm to swing said pawl out of 'tooth-engaging position. t t 7 References Cited in the tile of this patent V v UNITED, STATES PATENTS opposite, direetion, and means -permitting axial movement of said piston and piston rod 'in a direction away from said nozzle comprising a plate 

